Great job, do you have any before and after pictures? Just been doing a couple of refurbs too, it is surprising how easy it can be to get a decent sort of refurb, it just costs a bit of money to start up!
With a bit of time and care taken you can do a half decent job on most bats with just sand paper I've found. I love doing refurbs and repairs on bats
I was using an orbital sander as well and it did quite a good job with the face but wasn't as good with the back unless it had no concaving what so ever.Bought that drum sanding kit off ebay for about £40-£50 i think, and that works really well. Only problem i find with it is getting a new sheet on the dam thing! Also helps sanding in one direction with the grain